CN117773345A - Titanium alloy surface treatment method based on femtosecond laser and application - Google Patents
Titanium alloy surface treatment method based on femtosecond laser and application Download PDFInfo
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 180
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000004381 surface treatment Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 230000003287 optical effect Effects 0.000 claims abstract description 38
- 239000002086 nanomaterial Substances 0.000 claims abstract description 29
- 239000012153 distilled water Substances 0.000 claims abstract description 25
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 25
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000013532 laser treatment Methods 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 13
- 230000003075 superhydrophobic effect Effects 0.000 claims description 11
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 7
- 239000003208 petroleum Substances 0.000 claims description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 abstract description 14
- 238000005260 corrosion Methods 0.000 abstract description 14
- 238000007306 functionalization reaction Methods 0.000 abstract description 8
- 238000011282 treatment Methods 0.000 abstract description 7
- 230000002787 reinforcement Effects 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 6
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 4
- 230000004913 activation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- -1 oxygen ions Chemical class 0.000 description 3
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000006557 surface reaction Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000005542 laser surface treatment Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a titanium alloy surface treatment method based on femtosecond laser and application thereof, wherein the titanium alloy surface treatment method based on the femtosecond laser comprises the following steps: s1, adjusting an optical path system to enable femtosecond laser emitted by the optical path system to meet preset parameters; s2, placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be located below the water surface for a preset distance; s3, performing surface treatment on the titanium alloy sample in the distilled water through femtosecond laser emitted by the optical path system so as to enable the surface of the titanium alloy sample to form a super-hydrophilic nano structure and titanium oxide. According to the technical scheme, the functionalization and reinforcement of the titanium alloy surface are realized through one-time treatment, so that the wettability, hardness and corrosion resistance of the titanium alloy surface are synchronously improved.
Description
Technical Field
The invention relates to the technical field of titanium alloy surface treatment, in particular to a titanium alloy surface treatment method based on femtosecond laser and application thereof.
Background
The titanium alloy has excellent comprehensive properties such as high specific strength, low density, excellent corrosion resistance and the like, and has important application value and wide application prospect in the fields of aerospace, chemical industry, energy engineering, ocean and the like. For example, petroleum drilling tools commonly used in the field of marine equipment are mostly made of titanium alloys. Because the petroleum drilling equipment has a severe use environment, the submarine drilling stratum structure is complex, and therefore, the performance requirement on the titanium alloy is higher.
The laser impact technology is a method for realizing material surface treatment based on the pulse laser force effect. In the prior art, the surface of the titanium alloy is generally impacted by laser in the atmosphere, and the method can not realize the functionalization and reinforcement of the surface of the titanium alloy at the same time through one-time treatment, so that the wettability, hardness and corrosion resistance of the surface of the titanium alloy can not be synchronously improved.
Disclosure of Invention
The invention mainly aims to provide a titanium alloy surface treatment method based on femtosecond laser, which aims to simultaneously realize functionalization and reinforcement of the titanium alloy surface through one-time treatment, so that the wettability, hardness and corrosion resistance of the titanium alloy surface are synchronously improved.
In order to achieve the above purpose, the method for treating the surface of the titanium alloy based on the femtosecond laser provided by the invention comprises the following steps:
s1, adjusting an optical path system to enable femtosecond laser emitted by the optical path system to meet preset parameters;
s2, placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be located below the water surface for a preset distance;
s3, performing surface treatment on the titanium alloy sample in the distilled water through femtosecond laser emitted by the optical path system so as to enable the surface of the titanium alloy sample to form a super-hydrophilic nano structure and titanium oxide.
In one embodiment, the femtosecond laser satisfies the following parameters:
the laser pulse width is 35fs, the laser wavelength is 800nm, the laser power is 0.005-2.5W, the single pulse energy is 0.9-7 mu J, and the pulse laser beam diameter is 1cm.
In one embodiment, in step S3, the femtosecond laser scans the surface of the titanium alloy sample for 1-3 times by adopting a serpentine reciprocating scanning path, wherein the scanning speed is 1-200 mm/S, and the scanning interval is 0.01-0.8 mm.
In one embodiment, the femtosecond laser is of the titanium sapphire type.
In one embodiment, in step S2, the preset distance is 8mm to 15mm.
In one embodiment, in step S2, the preset distance is 10mm.
In one embodiment, step S3 further includes: and a high-speed camera is adopted to monitor the processing process in real time, and monitoring data is fed back to a control system.
In one embodiment, the following steps are further included after step S3:
and S4, heating the titanium alloy sample subjected to femtosecond laser treatment at a preset temperature to convert the super-hydrophilic nano structure formed on the surface of the titanium alloy sample into the super-hydrophobic nano structure.
In one embodiment, in step S4, the preset temperature is 200 ℃ to 300 ℃.
Use of a titanium alloy processed according to the femtosecond laser-based titanium alloy surface treatment method described above in an oil drilling tool.
The technical scheme of the invention provides a titanium alloy surface treatment method based on femtosecond laser, which comprises the steps of firstly, adjusting an optical path system to enable the femtosecond laser emitted by the optical path system to meet preset parameters; placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be positioned below the water surface for a preset distance; and then performing surface treatment on the titanium alloy sample in distilled water by femtosecond laser emitted by the optical path system so as to form a super-hydrophilic nano structure and titanium oxide on the surface of the titanium alloy sample. Thus, the functionalization and reinforcement of the titanium alloy surface are realized through one-time treatment, so that the wettability, hardness and corrosion resistance of the titanium alloy surface are synchronously improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an embodiment of a method for treating a titanium alloy surface based on a femtosecond laser;
FIG. 2 is a schematic view of another embodiment of a method for treating a titanium alloy surface based on a femtosecond laser;
FIG. 3 is a schematic diagram of a scanning path of a femtosecond laser according to an embodiment of the invention;
FIG. 4 is a scanning electron microscope image of a titanium alloy surface treated by an embodiment of the present invention;
FIG. 5 is a schematic view showing the contact angle of the titanium alloy surface in three states; wherein, (a) the contact angle of the surface of the titanium alloy sample in the polished or untreated state; (b) The contact angle of the surface of the titanium alloy sample in the femtosecond laser treated state; (c) After the femtosecond laser treatment is finished, the contact angle of the surface of the titanium alloy sample is treated by heat at 250 ℃;
FIG. 6 is a microstructure of a titanium alloy sample surface in two states; wherein, (a) a surface microstructure of the titanium alloy sample in an untreated state; (b) A microstructure chart of the surface of the titanium alloy sample in the finished state of femtosecond laser treatment;
FIG. 7 is an X-ray photoelectron spectrum of a titanium alloy surface treated by an embodiment of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is involved in the embodiment of the present invention, the directional indication is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a titanium alloy surface treatment method based on femtosecond laser.
Referring to fig. 1, in an embodiment of the invention, the method for treating a titanium alloy surface based on femtosecond laser includes the following steps:
s1, adjusting an optical path system to enable femtosecond laser emitted by the optical path system to meet preset parameters;
s2, placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be located below the water surface for a preset distance;
s3, performing surface treatment on the titanium alloy sample in the distilled water through femtosecond laser emitted by the optical path system so as to enable the surface of the titanium alloy sample to form a super-hydrophilic nano structure and titanium oxide.
Specifically, during processing, the optical path of the optical path system is first adjusted, for example, the laser power is adjusted to a desired value by using a half-wave plate and a beam splitter. And placing the titanium alloy sample in distilled water, and completely soaking the titanium alloy sample in the water to enable the titanium alloy sample to be positioned below the water surface for a preset distance. And then, utilizing the femtosecond laser emitted by the optical path system to impact and irradiate the surface of the titanium alloy in the water according to a preset scanning path. Because the femtosecond laser has faster pulse width compared with the common laser, the titanium alloy surface can be rapidly ablated and deposited, meanwhile, the femtosecond laser directly irradiates the titanium alloy sample surface through the water surface, the femtosecond laser can also cause the oscillation of a water body to further strengthen the impact on the titanium alloy surface while impacting the titanium alloy sample surface, the laser shot blasting is realized, the microstructure of the titanium alloy surface is changed, and the titanium alloy surface can form periodic superThe hydrophilic nano structure improves the infiltration performance of the titanium alloy surface. And the femtosecond laser has very high energy density, and can decompose water into H in a very short time + And O 2 - And the nano structure generated by the femtosecond laser can improve the surface activation energy, so that the oxygen ions and the titanium alloy can form titanium oxide at normal temperature, and further the surface hardness and corrosion resistance of the titanium alloy sample are improved. Thus, the functionalization and reinforcement of the titanium alloy surface are realized simultaneously through one-time treatment. Wherein, the surface functionalization means to realize super-hydrophilicity or super-hydrophobicity of the surface of the titanium alloy, and the strengthening means femtosecond laser shot blasting (microstructure change).
The technical scheme of the invention provides a titanium alloy surface treatment method based on femtosecond laser, which comprises the steps of firstly, adjusting an optical path system to enable the femtosecond laser emitted by the optical path system to meet preset parameters; placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be positioned below the water surface for a preset distance; and then performing surface treatment on the titanium alloy sample in distilled water by femtosecond laser emitted by the optical path system so as to form a super-hydrophilic nano structure and titanium oxide on the surface of the titanium alloy sample. Thus, the functionalization and reinforcement of the titanium alloy surface are realized through one-time treatment, so that the wettability, hardness and corrosion resistance of the titanium alloy surface are synchronously improved.
In order to achieve better functionalization and strengthening effects on the titanium alloy surface by using the femtosecond laser, and improve the machining efficiency, parameters of the femtosecond laser are optimally designed, and in one embodiment, the femtosecond laser meets the following preset parameters: the laser pulse width is 35fs, the laser wavelength is 800nm, the laser power is 0.005-2.5W, the single pulse energy is 0.2-9 mu J, and the pulse laser beam diameter is 1cm.
In this embodiment, by optimally designing parameters such as laser pulse width, laser wavelength, laser power, single pulse energy, and pulse laser beam diameter, the femtosecond laser beam finally emitted by the optical path system can perform better surface treatment and strengthening effects on the surface of the titanium alloy sample under the water surface, and the energy density of the femtosecond laser is higher, which is more beneficial to water in a very short timeInternal decomposition into H + And O 2 - And the nano structure generated by the femtosecond laser can improve the surface activation energy, so that the oxygen ions and the titanium alloy form titanium oxide at normal temperature in a shorter time, and further the surface hardness and corrosion resistance of the titanium alloy sample are improved. In addition, the laser pulse width is 35fs, the duration of the laser pulse is short, and the surface of the material can be processed more accurately, so that the effect of surface treatment can be realized by only scanning once. And the smaller the pulse width is, the more laser pulses are generated in the same time, and the processing efficiency can be improved. Alternatively, the laser power is 0.01 to 0.1W. Alternatively, the single pulse energy is 0.9 to 7. Mu.J.
In order to further improve the processing efficiency, in the step S3, the femtosecond laser scans the surface of the titanium alloy sample for 1-3 times by adopting a serpentine reciprocating scanning path, wherein the scanning speed is 1-200 mm/S, and the scanning interval is 0.01-0.8 mm. Compared with a grid-shaped scanning path, the serpentine reciprocating scanning has higher efficiency and belongs to one-time scanning; and through carrying out optimal design on parameters such as a scanning path, a scanning speed, a scanning interval and the like, the surface functionalization and strengthening treatment of the titanium alloy sample can be realized through 1-3 times of scanning, repeated scanning is not needed for a plurality of times, and the processing efficiency can be improved. As shown in fig. 3, a schematic diagram of scanning by using a serpentine scanning path according to the present embodiment is shown, where d represents a scanning interval.
Alternatively, the kind of femtosecond laser adopts a titanium sapphire laser.
In step S2, the titanium alloy sample is placed in distilled water and the titanium alloy sample is placed below the water surface by a preset distance. Optionally, in step S2, the preset distance is 8mm to 15mm.
The preset distance is too large or too small, so that the strengthening effect on the surface of the titanium alloy is weakened, when the preset distance is too small, the contact distance between the laser and water is too short, the water cannot be well ionized, and when the preset distance is too large, the energy loss of the laser in the water is too large, and the effective impact on the surface of the titanium alloy cannot be achieved. The preset distance is 8 mm-15 mm, so that the titanium alloyThe distance between the top surface of the sample and the water surface is moderate, so that the femtosecond laser can be ensured to have higher energy density, and the water can be decomposed into H in extremely short time + And O 2 - Meanwhile, the method is also beneficial to the femtosecond excitation to generate periodic nano structures on the surface of the titanium alloy in a short time, the nano structures can improve the surface activation energy, and more beneficial to the oxygen ions and the titanium alloy to form titanium oxide at normal temperature in a short time, so that the surface hardness and the corrosion resistance of a titanium alloy sample are improved, and a better strengthening effect is achieved on the surface of the titanium alloy. Optionally, in step S2, the preset distance is 10mm.
In order to ensure the processing quality, in an embodiment, step S3 further includes: and a high-speed camera is adopted to monitor the processing process in real time, and monitoring data is fed back to a control system. Thus, when the control system determines that the machining state is abnormal according to the fed-back monitoring data, the machining is stopped. And further, the processing parameters can be adjusted by a manual or control system so as to ensure the processing precision. The processing state is monitored in real time through the high-speed camera, so that the processing quality can be improved, and the trial-and-error cost is reduced.
On the basis of the above embodiment, as shown in fig. 2, in an embodiment, after step S3, the following steps are further included:
and S4, heating the titanium alloy sample subjected to femtosecond laser treatment at a preset temperature to convert the super-hydrophilic nano structure formed on the surface of the titanium alloy sample into the super-hydrophobic nano structure.
Specifically, in the step S3, the femtosecond laser emitted by the optical path system performs surface treatment on the titanium alloy sample in the distilled water, so that the super-hydrophilic nano structure and titanium oxide are formed on the surface of the titanium alloy sample, and the step can obtain the titanium alloy with super-hydrophilic performance. If the titanium alloy with the superhydrophobic performance is obtained, the superhydrophilic nanostructure formed on the surface of the titanium alloy sample can be converted into the superhydrophobic nanostructure only by further heating the titanium alloy sample obtained in the step S3, so that the titanium alloy can be rapidly converted between superhydrophilic and superhydrophobic so as to better meet different application scenes.
Optionally, in step S4, the preset temperature is 200 ℃ to 300 ℃. For example, the preset temperature may be 200 ℃, 250 ℃, 300 ℃, or the like. By adopting relatively high heating temperature, the method is beneficial to realizing the conversion from super-hydrophilic property to super-hydrophobic property on the surface of the titanium alloy in a short time, and can improve the processing efficiency.
The titanium alloy processed by the femtosecond laser-based titanium alloy surface treatment method is applied to petroleum drilling tools. The petroleum drilling tool manufactured by the titanium alloy processed by the femtosecond laser-based titanium alloy surface treatment method has higher hardness and corrosion resistance, has super-hydrophilicity or super-hydrophobicity, and can be well suitable for marine environments.
Example 1
A titanium alloy surface treatment method based on femtosecond laser comprises the following steps:
s1, adjusting an optical path system to enable femtosecond laser emitted by the optical path system to meet preset parameters;
s2, placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be located below the water surface for a preset distance;
s3, performing surface treatment on the titanium alloy sample in the distilled water through femtosecond laser emitted by the optical path system so as to enable the surface of the titanium alloy sample to form a super-hydrophilic nano structure and titanium oxide.
The laser pulse width is 35fs, the laser wavelength is 800nm, the laser power is 0.002W, the single pulse energy is 0.5 mu J, the pulse laser beam diameter is 1cm, the serpentine reciprocating scanning is carried out for 1 time, the scanning speed is 50mm/s, and the scanning interval is 0.5mm.
The surface hardness of the titanium alloy which is not subjected to femtosecond laser surface treatment is 290HV, and the contact angle is 70 degrees. The titanium alloy treated in example one had a surface hardness of 300HV and a contact angle of 65 °, which was improved with respect to the untreated titanium alloy, while the hydrophilic properties were improved. And the X-ray photoelectron spectroscopy test shows that titanium oxide is generated on the surface of the titanium oxide, so that the surface strength and the corrosion resistance are improved.
Example two
A titanium alloy surface treatment method based on femtosecond laser comprises the following steps:
s1, adjusting an optical path system to enable femtosecond laser emitted by the optical path system to meet preset parameters;
s2, placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be located below the water surface for a preset distance;
s3, performing surface treatment on the titanium alloy sample in the distilled water through femtosecond laser emitted by the optical path system so as to enable the surface of the titanium alloy sample to form a super-hydrophilic nano structure and titanium oxide.
The laser pulse width is 35fs, the laser wavelength is 800nm, the laser power is 0.05W, the single pulse energy is 0.26 mu J, the pulse laser beam diameter is 1cm, the serpentine reciprocating scanning is carried out for 1 time, the scanning speed is 20mm/s, and the scanning interval is 0.5mm.
Through tests, the surface hardness of the titanium alloy treated by the second embodiment is 360HV, the contact angle is 0 degrees, and compared with the untreated titanium alloy, the surface hardness of the titanium alloy is greatly improved, and meanwhile, the hydrophilia is greatly improved, and the titanium alloy is converted into super-hydrophilia. And the X-ray photoelectron spectroscopy test shows that titanium oxide is generated on the surface of the titanium oxide, so that the surface strength and the corrosion resistance are improved.
As shown in fig. 4, a scanning electron microscope image of the surface of the titanium alloy sample subjected to the femtosecond laser treatment in this embodiment is shown, and it can be seen from the image that the surface of the titanium alloy sample subjected to the femtosecond laser treatment forms a periodic micro-nano structure. The nanostructure is of the ravine type, the size of the groove is 0.212+/-0.029 mu m, and the size of the protrusion is 0.356+/-0.067 mu m. The periodic structure can obviously improve the surface energy of the titanium alloy surface and shows the hydrophilic characteristic.
FIG. 5 is a schematic view showing the contact angle of the titanium alloy surface in three states; wherein, (a) the contact angle of the surface of the titanium alloy sample in the polished or untreated state; (b) The contact angle of the surface of the titanium alloy sample in the femtosecond laser treated state; (c) And after the femtosecond laser treatment is finished, the contact angle of the surface of the titanium alloy sample in a 250 ℃ heat treatment state is further carried out. As can be seen from the graph, the contact angle of the surface of the untreated sample is 70 °, and the contact angle of the surface of the sample after the femtosecond laser treatment is 0 °, and the super-hydrophilic performance is shown. The sample after femtosecond laser treatment is subjected to heat treatment, and the surface contact angle is 151 degrees, so that the superhydrophobic performance is shown. Therefore, the titanium alloy subjected to the femtosecond laser treatment can realize super-hydrophilic performance, and the super-hydrophilic performance can be directly converted into super-hydrophobic performance by only adding a heat treatment process after the femtosecond laser treatment is finished. Thus, the functionalization of the titanium alloy surface can be realized synchronously through a simpler process.
As shown in fig. 6, a microstructure of the surface of the titanium alloy sample in two states is shown; wherein, (a) a surface microstructure of the titanium alloy sample in an untreated state; (b) And (5) carrying out surface microstructure diagram of the titanium alloy sample in a femtosecond laser treated state. As can be seen from the figure, no dislocation is basically observed in the untreated sample, the microstructure after the femtosecond laser treatment is broken, and the dislocation density is obviously improved, which indicates that the strength of the sample after the femtosecond laser treatment is improved.
As shown in fig. 7, an X-ray photoelectron spectrum of the surface of the titanium alloy sample subjected to the femtosecond laser treatment in the embodiment is shown; from the figure, it can be seen that TiO appears on the surface of the sample after femtosecond laser treatment 2 Indicating that titanium oxide appeared on the surface of the part after the femtosecond laser treatment.
Example III
A titanium alloy surface treatment method based on femtosecond laser comprises the following steps:
s1, adjusting an optical path system to enable femtosecond laser emitted by the optical path system to meet preset parameters;
s2, placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be located below the water surface for a preset distance;
s3, performing surface treatment on the titanium alloy sample in the distilled water through femtosecond laser emitted by the optical path system so as to enable the surface of the titanium alloy sample to form a super-hydrophilic nano structure and titanium oxide.
The laser pulse width is 35fs, the laser wavelength is 800nm, the laser power is 0.05W, the single pulse energy is 0.26 mu J, the pulse laser beam diameter is 1cm, the serpentine reciprocating scanning is carried out for 3 times, the scanning speed is 20mm/s, and the scanning interval is 0.5mm.
The laser parameters in the third embodiment are basically the same as those in the second embodiment, except that the number of scans is increased, and the surface hardness of the corresponding titanium alloy is improved. Through tests, the surface hardness of the titanium alloy treated by the third embodiment is 362HV, the contact angle is 0 degrees, and compared with the untreated titanium alloy, the surface hardness of the titanium alloy is greatly improved, and meanwhile, the hydrophilia is greatly improved, and the titanium alloy is converted into super-hydrophilia. And the X-ray photoelectron spectroscopy test shows that titanium oxide is generated on the surface of the titanium oxide, so that the surface strength and the corrosion resistance are improved.
Example IV
A titanium alloy surface treatment method based on femtosecond laser comprises the following steps:
s1, adjusting an optical path system to enable femtosecond laser emitted by the optical path system to meet preset parameters;
s2, placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be located below the water surface for a preset distance;
s3, performing surface treatment on the titanium alloy sample in the distilled water through femtosecond laser emitted by the optical path system so as to form a super-hydrophilic nano structure and titanium oxide on the surface of the titanium alloy sample;
the laser pulse width is 35fs, the laser wavelength is 800nm, the laser power is 0.05W, the single pulse energy is 0.26 mu J, the pulse laser beam diameter is 1cm, the serpentine reciprocating scanning is carried out for 1 time, the scanning speed is 20mm/s, and the scanning interval is 0.5mm.
And S4, heating the titanium alloy sample subjected to femtosecond laser treatment at the temperature of 250 ℃ so as to convert the super-hydrophilic nano structure formed on the surface of the titanium alloy sample into the super-hydrophobic nano structure.
In the fourth embodiment, a one-step heat treatment process is added on the basis of the second embodiment. Through testing, the surface hardness of the titanium alloy treated by the third embodiment is 362HV, the contact angle is 151 degrees, and the titanium alloy is converted into super-hydrophobic performance. And the X-ray photoelectron spectroscopy test shows that titanium oxide is generated on the surface of the titanium oxide, so that the surface strength and the corrosion resistance are improved.
Embodiment five, a titanium alloy surface treatment method based on femtosecond laser comprises the following steps:
s1, adjusting an optical path system to enable femtosecond laser emitted by the optical path system to meet preset parameters;
s2, placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be located below the water surface for a preset distance;
s3, performing surface treatment on the titanium alloy sample in the distilled water through femtosecond laser emitted by the optical path system so as to form a super-hydrophilic nano structure and titanium oxide on the surface of the titanium alloy sample;
the laser pulse width is 35fs, the laser wavelength is 800nm, the laser power is 4W, the single pulse energy is 9 mu J, the pulse laser beam diameter is 1cm, the serpentine reciprocating scanning is carried out for 1 time, the scanning speed is 60mm/s, and the scanning interval is 0.5mm.
The surface hardness of the titanium alloy treated by the comparative example is 320HV, and the contact angle is 38 degrees. The surface hardness is improved and the hydrophilic properties are improved compared to untreated titanium alloys.
Table one: titanium alloy surface hardness and contact angle under different femtosecond laser parameters.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The titanium alloy surface treatment method based on the femtosecond laser is characterized by comprising the following steps of:
s1, adjusting an optical path system to enable femtosecond laser emitted by the optical path system to meet preset parameters;
s2, placing the titanium alloy sample in distilled water, and enabling the titanium alloy sample to be located below the water surface for a preset distance;
s3, performing surface treatment on the titanium alloy sample in the distilled water through femtosecond laser emitted by the optical path system so as to enable the surface of the titanium alloy sample to form a super-hydrophilic nano structure and titanium oxide.
2. The method for treating a titanium alloy surface based on a femtosecond laser according to claim 1, wherein the femtosecond laser satisfies the following parameters:
the laser pulse width is 35fs, the laser wavelength is 800nm, the laser power is 0.005-2.5W, the single pulse energy is 0.2-9 mu J, and the pulse laser beam diameter is 1cm.
3. The method for treating the surface of the titanium alloy based on the femtosecond laser according to claim 1, wherein in the step S3, the femtosecond laser scans the surface of the titanium alloy sample 1 to 3 times by adopting a serpentine reciprocating scanning path at a scanning speed of 1mm/S to 200mm/S and a scanning interval of 0.01 to 0.8mm.
4. The method for treating a titanium alloy surface by using a femtosecond laser according to claim 1, wherein the kind of the femtosecond laser is a titanium sapphire laser.
5. The method for treating a titanium alloy surface based on a femtosecond laser as recited in claim 1, wherein in step S2, the preset distance is 8mm to 15mm.
6. The method for treating a titanium alloy surface based on a femtosecond laser as recited in claim 5, wherein in step S2, the preset distance is 10mm.
7. The method for treating a titanium alloy surface based on femtosecond laser as set forth in claim 1, wherein the step S3 further comprises: and a high-speed camera is adopted to monitor the processing process in real time, and monitoring data is fed back to a control system.
8. The femtosecond laser-based titanium alloy surface treatment method according to any one of claims 1 to 7, further comprising the steps of, after step S3:
and S4, heating the titanium alloy sample subjected to femtosecond laser treatment at a preset temperature to convert the super-hydrophilic nano structure formed on the surface of the titanium alloy sample into the super-hydrophobic nano structure.
9. The method for treating a titanium alloy surface based on a femtosecond laser as claimed in claim 8, wherein in the step S4, the preset temperature is 200 to 300 ℃.
10. Use of the titanium alloy processed by the femtosecond laser-based titanium alloy surface treatment method as defined in any one of claims 1 to 9 in petroleum drilling tools.
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